TESTS 1479 



TABLE OF TESTS.— Continued. 



TESTS 



Use. 



Reagents. 



Reaction. 



Application. 



Remarks. 



iriess' test. 



Nitrites in saliva. 



(a) Sulphuric acid, (b) 

 Metadiam ido -ben- 

 zol. 



Intense, yellow 

 color. 



Dilute saliva with 5 

 vols, water ; add a 

 few drops a and b. 



Irismer's test. 



Glucose in urine. 



(a) 1 : 1000 sol. safranin. 

 (*) Potass, hydrate. 



Decolorization de- Boil 1 c.c. urine with Not reliable, 

 notes glucose. ! 5 c.c. a and 2 c.c. b. 



Blood. 



See Van Deen's test. 

 A/men's test, and 

 Huehnerf eld's test. 



Hydrocyanic acid. See Schbnbein' s test. 



'.uareschi's test. 



Phenol. 



Chloroform. 



Red ppt. sol. in Treat warm alkaline 

 alcohol. sol. of phenyl with R. 



lunzburg's test. 



Hydrochloric acid Phloroglucin -vanillin Red color ; cherry'- To a few drops of juice 

 in gastric juice. sol. : Phloroglucin 2, i red crystals. in evaporating dish 



vanillin 1, absolute j add a drop of R. and 



alcohol 30. warm gently. 



in 15,000; very 

 delicate. 



Arsenic. 



(a) Zinc, (b) Sulphuric 

 acid 10, water 190. 



(c) Sol. lead acetate. 



(d) Sat. sol. silver ni- 

 trate acidulated 

 with nitric acid. 



Bright -yellow Place a piece of a in 

 stain, becoming test-tube with 5 c.c. 



black or brown 

 on addition of 

 water. 



of*; add liquid, not 

 exceeding 1 c.c. 

 About 1 cm. below 

 open end of test-tube 

 insert a glass-wool 

 or cotton plug moist- 

 ened with 0.5 c. 

 Cover tube with 3 

 thicknesses filter-pa- 

 per, applying to up- 

 per one a drop of d 

 Stand aside in a 

 dark place. 



Ammonia. 



To acid sol. of mer- 

 curic nitrate add sol. 

 potass, bromid until 

 first ppt. is redis- 

 solved ; then add 

 potass, hydrate till 

 orange-yellow ppt. 

 appears. Filter. 



White precipitate. 



Mix R. and liquid. 



iuyot's test. 



i Iodoform. 



Starch. 



Blue color. 



Heat in flask, and pass 

 vapor through a 

 heated tube over R. 



I Strychnin. 



(a) Sulphuric acid, {b) 

 Lead dioxid. 



Bluish-violet color. Mix a and b with 

 liquid. 



Alkaloids. 



Sol. picric acid (1:1000). 



Yellow ppt. 



Add R. to liquid. 



Ammonia. 



Mercurous nitrate. 



Black ppt. or 

 brown color- 

 ation. 



Add R. to liquid. 



Arsenic. 



(a) Potass, hvdrate. 

 (b) Zinc, (c) Ribbon 

 of magnesium. 



Evolution of arsin. Heat liquid with a in 

 which is tested I excess, b, and small 

 in any conveni- ; piece of c. 

 ent way. 



Arsenic. 



Dextrin. 



Glucose. 



Nitric acid. 



(a) Hvdrochloric acid. 

 (*) Tinfoil. 



Steel-colored 

 brown stain. 



to 



Acidify with a, drop 

 in b, heat to 90 C. 



(*) Ammonium molyb- Blue color, 

 date, (b) Citric acid. 



Mercuric oxid (red) 30, 

 sodium acetate 30, 

 glac. acetic acid 25, 

 sodium chlond 50, 

 water 400. After 

 solution dilute up to 

 1000. 



(a) Molybdic acid. (*) 

 Sugar. 



Nitrobenzol in oil 

 of bitter almonds. 



45 per cent, alcohol. 



Ppt. of mercurous 

 chlorid. 



Blue color. 



Cloudiness. 



Boil liquid with a and 



a. 



Add excess of R. to 

 liquid. 



Add a and b. 



Dissolve 10 drops oil 

 in 10 c.c. R. 



Nitrous acid. 



Carbolic acid. 



Red, then brown 

 and green color- 

 ation. 



Phosphorus. (a) Ether or benzine. Black stain. 



(*) Strip of silver- 

 I nitrate paper. 



Add R. to liquid. 



i 



Dissolve in a, heat to [ 



30-40 C, and expose 



b to vapors. 



